import {asyncRouterMap, constantRouterMap} from '@/router'

/**
 * 通过meta.role判断是否与当前用户权限匹配
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.some(role => route.meta.roles.indexOf(role) >= 0)
  } else {
    return true
  }
}

/**
 * 递归过滤异步路由表，返回符合用户角色权限的路由表
 * @param asyncRouterMap
 * @param roles
 */
function filterAsyncRouter(asyncRouterMap, roles) {
  const accessedRouters = asyncRouterMap.filter(route => {
    if (hasPermission(roles, route)) {
      if (route.children && route.children.length) {
        route.children = filterAsyncRouter(route.children, roles)
      }
      return true
    }
    return false
  })
  return accessedRouters

  // let accessedRouters = []
  // for (var r of pAsyncRouterMap) {
  //   if (hasPermission(roles, r)) {
  //     if (r.children && r.children.length) {
  //       let accessedRouter = {
  //         path: r.path,
  //         name: r.name,
  //         component: r.component,
  //         redirect: r.redirect,
  //         meta: r.meta,
  //         hidden: r.hidden,
  //         children: []
  //       }
  //       accessedRouter.children = filterAsyncRouter(r.children, roles)
  //       if (accessedRouter.children.length != 0) {
  //         accessedRouters.push(accessedRouter)
  //       }
  //       continue
  //     }
  //     accessedRouters.push(r)
  //   }
  // }
  // return accessedRouters
}

const permission = {
  state: {
    routers: constantRouterMap,
    addRouters: []
  },
  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers
      state.routers = constantRouterMap.concat(routers)
    }
  },
  actions: {
    GenerateRoutes({commit}, data) {
      return new Promise(resolve => {
        const {roles} = data
        let accessedRouters
        if (roles.indexOf('admin') >= 0) {
          accessedRouters = asyncRouterMap
        } else {
          accessedRouters = filterAsyncRouter(asyncRouterMap, roles)
        }

        commit('SET_ROUTERS', accessedRouters)
        resolve()
      })
    }
  }
}

export default permission
